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2. VENONA 


USSR . Ruf. Now: 
ne a - . Issued! 
: Copy No.: ~ie/ 
3atD) REISSUE 


"EVANT' s" INFORMATION ON A METHOD OF SEPARATION OF "ENORMAS" (7943) 


= 


From: NEW YORE 
To: MOSCOW 
Nos.t 972, 979, 993 22-23 June 1943 
(3-part message complete] 
(PART I] aR CeaeiAn from "KVANT"(i]. Translated from the English. 


The basic idea for a method of separation of NENORMAZ"[ii] consists in 
_ repeated (1 group unrecovered] distillation by sublimation (vaporisation from 


a erystal(C% line] state) and repid condensation of vapours. With the 


specified [C¥ components] the degree(iii] of vaporisation of chemicallyLiv] 


[2 groups unrecovered] identical molecules (put different in mass) is 


inversely proportional to the square root ef the mass and directly proportional 
to the partial vapour pressure sustained by a molecule without condensation. 


On the other hand the partial vapour presaure of such molecules, in 


accordance with quantum mechanics, is inversely proportional to the cube of 
the square root of the mass. Consequently the speeds at which two isotopic 


molecules (7 groups unrecovered] will be proportional to the square 
(19 groups unrecovered] 


[Continued overleaf] 


VERIO 


95 VERO i! A 


FOP-SECREF— 
Sees 


m, is the mass of the light molevules 


m,-48 the mass of the heavy molecules 


sm =() 


x 
1) » 
Where: q?(1) 4s the quantity of light molecules 
. (42 groups unrecoverable] 
[PARTIINRé so that]; x = 1 at the beginning of distillation, 


Then: ‘(Ux _ x, 
q' (4 


Where: q'(x) and q'(1) 
($5 groups unrecoverable ] 
otencewecenEyCentaaie en 


and mF = a'n(m) 
q'n 41 
[42 groups unrecovered ] 
(of af] the identical quantity of (BS lighter] 
[52 groups unrecoverable | 


nF, (iv] 
(26 groups unrecovered] 
PART Itt! Let a2 = 7 
1—x « 


p = quantity of light molecules 
total quantity of molecules in 


(12 groups unrecovered] 


VENON* 


a. a se 2 


FOP-SECREP 


1 


[415 groups unrecovered | 


Let gn (x) 


sh tcteceteuebeheten =e 
Then! 
[67 groups unrecoverable] 
and py (x) 
(9 groups unrecovered ] 
easily calculate the theoretical 


[45 groups unrecoverable] 


SPREE SERA EERE * 
No. 534[vii] [Signature unrecoverable ] 
Footnotes: [i] KVANT: ie "QUANTUM"; unidentified covername. Also 


cours , YORK'’s Nos. 961 of 21 June 1943 
and ‘485 of 27 August 1943 


[ai] ENORMAZ: ie ""NORMOUS" (usually ocoura as "ENORMOZ" )# 
coverword for the US Atomic Energy Project, but 
its meaning is clearly restricted to U7" in 


this text and YORK No. 345 of 
48 April 494 


(iai] Or perhaps "ratio". 
[iv] Or "of a chemical". 


[v] In the technical part of the message the punctuation of 
the original has been retained. 


[vi] NF,: Presumably 4 mistake for UF, (uranium hexa- 
fluoride), 


[vii] 4oned in NEY YORK's No. 1405 of 27 August 1943 
a ef(i]. 


| VEMONA 


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